As far as pulling away from the kids, I know it is not really my fault but is my absorbing myself in them to make sure they are ok keeping her away from them because she does not want to spend time with me?
No, not at all. If she really wanted to spend time with her kids, you couldn't stop her if you tried. Unfortunately, it is the mindset of a WW. And btw, a WW knows right from wrong! No matter what you did, she still makes her own choices out of a free will. That goes double for any relationships she decides to have.
You can only own your share of the breakdown in the MR. Do not take the blame for what she does or doesn't do. Oh, she may point her finger at you, but that's when you need to apply the rule about not believing what she says.
Very wise decision getting a lawyer!
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!